Topic: Biology

Researchers discovered a way to study life before the first common ancestor. They found genes that existed even earlier than the last universal common ancestor.

Every living thing on Earth shares a single ancestor that lived about four billion years ago. Scientists call this organism the 'last universal common ancestor.' Studying this ancient ancestor shows us many features we see in modern life were already present back then. Cells had membranes, and genetic information was stored in DNA.

However, scientists want to know how life first emerged on Earth. To do this, they need to look even further back in time, to evolutionary events that occurred before the shared ancestor existed.

A team of researchers from Oberlin College, MIT, and the University of Wisconsin-Madison found a way to explore this earlier period of evolution. They focused on special genes called 'universal paralogs.' These genes preserve evidence of biological changes that took place before the last universal common ancestor.

The team analyzed all known universal paralogs and found that every one of these genes plays a role in either building proteins or moving molecules across cell membranes. This suggests that protein production and membrane transport were among the first biological functions to evolve.

Why It Matters

Understanding how life emerged on Earth can help us better appreciate the diversity of species we see today. It can also inspire new discoveries and innovations in fields like medicine, agriculture, and environmental science.

Key Facts

• The last universal common ancestor lived about four billion years ago.
• Universal paralogs are genes that existed even before this shared ancestor.
• These genes preserve evidence of biological changes that took place before the last universal common ancestor.
• Protein production and membrane transport were among the first biological functions to evolve.
• The study was published in the journal Cell Genomics.

Key Terms

Universal Paralogs

A group of genes that appear multiple times within a single genome, preserving evidence of biological changes that took place before the last universal common ancestor.

Implications

Understanding how life emerged on Earth can help us better appreciate the diversity of species we see today. It can also inspire new discoveries and innovations in fields like medicine, agriculture, and environmental science.